| 6 |
use File::Slurp; |
use File::Slurp; |
| 7 |
use File::Path; |
use File::Path; |
| 8 |
use Getopt::Long; |
use Getopt::Long; |
| 9 |
|
use Data::Dump qw/dump/; |
| 10 |
|
|
| 11 |
my $dev = '/dev/sdb2'; |
my $dev = '/dev/sdb'; |
| 12 |
my $mnt = '/mnt/42'; |
my $mnt = '/mnt/42'; |
| 13 |
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|
| 14 |
my ( $rollback, $commit ); |
my ( $verbose, $init, $debug ) = ( 1 ); |
| 15 |
|
|
| 16 |
GetOptions( |
GetOptions( |
| 17 |
'rollback!' => \$rollback, |
'init!' => \$init, |
| 18 |
'commit!' => \$commit, |
'debug!' => \$debug, |
| 19 |
) or die "unknown options: $!"; |
) or die "unknown options: $!"; |
| 20 |
|
|
|
map { mkdir $_ unless -e $_ } map { "$mnt/$_" } ( 'log', 'fs' ); |
|
| 21 |
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|
| 22 |
my $path = shift @ARGV || die "usage: $0 /path/to/file\n"; |
sub size { |
| 23 |
|
my $size = shift; |
| 24 |
my ($dir,$file) = ($1,$2) if $path =~ m{^(?:(.+)/)?([^/]+)}; |
$size =~ s{MB}{}; |
| 25 |
|
$size; |
| 26 |
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} |
| 27 |
|
|
| 28 |
my $seq; |
my @part; |
|
my $opos = 0; |
|
| 29 |
|
|
| 30 |
if ( -e "$mnt/last" ) { |
sub partitions { |
| 31 |
my $log = read_file("$mnt/last"); |
@part = (); |
| 32 |
$seq = readlink("$mnt/last"); |
open(my $parted, '-|', "parted -s $dev unit mb print free") || die "parted: $!"; |
| 33 |
$seq =~ s{^.+/(\d+)$}{$1} || die "can't parse sequence: $seq"; |
while(<$parted>) { |
| 34 |
$seq++; |
chomp; |
| 35 |
$opos = $1 if $log =~ m{opos:\s+(\d+\.\d[k])}; |
s{^\s+}{}; |
| 36 |
die "can't decode opos" unless $opos; |
next unless $_; |
| 37 |
warn "# seq: $seq start: $opos\n"; |
my @p = map { size($_) } split(/\s+/, $_ ); |
| 38 |
|
warn "## $_ ",dump( @p ) if $debug; |
| 39 |
} else { |
if ( $p[3] && $p[3] eq 'Free' ) { |
| 40 |
$seq = $#{ glob("$mnt/log/*") } + 1; |
$part[0] = [ @p ]; |
| 41 |
warn "# $mnt/last not found, recover seq: $seq\n"; |
} elsif ( $p[0] =~ m{^\d+$} ) { |
| 42 |
|
my $nr = shift @p; |
| 43 |
|
$part[$nr] = [ @p ]; |
| 44 |
|
} else { |
| 45 |
|
warn "SKIP ",dump( @p ) if $debug; |
| 46 |
|
} |
| 47 |
|
} |
| 48 |
|
warn "# part = ",dump( @part ) if $verbose; |
| 49 |
|
return @part; |
| 50 |
} |
} |
| 51 |
|
|
| 52 |
|
sub mount_42 { |
| 53 |
|
my $node = $dev . '1'; |
| 54 |
|
if ( ! -e $node ) { |
| 55 |
|
print STDERR "wait for $node"; |
| 56 |
|
sleep 1; |
| 57 |
|
while ( ! -e $node ) { |
| 58 |
|
print STDERR "."; |
| 59 |
|
sleep 1; |
| 60 |
|
} |
| 61 |
|
} |
| 62 |
|
warn "+ mount $node $mnt"; |
| 63 |
|
system("mount $node $mnt") == 0 or die "can't mount: $!"; |
| 64 |
|
} |
| 65 |
|
|
| 66 |
my $log = "$mnt/log/$seq"; |
my $remount_on = qr/(mkpart|rm)/; |
| 67 |
|
|
| 68 |
if ( -e $log ) { |
sub parted { |
| 69 |
print "ERROR $log exists!\n",read_file($log); |
my $command = shift; |
| 70 |
if ( $rollback ) { |
my @before = partitions(); |
| 71 |
unlink $log || die "can't rollback $log: $!"; |
|
| 72 |
die "RECOVERY removed $log\n"; |
system "umount $mnt" if $command =~ $remount_on; |
| 73 |
} elsif ( $commit ) { |
|
| 74 |
unlink "$mnt/last" || die "can't remove $mnt/last: $!"; |
warn "+ $command\n"; |
| 75 |
symlink $log,"$mnt/last" || die "can't commit $log: $!"; |
system("parted -s $dev unit mb $command") == 0 or die "parted: $?"; |
| 76 |
die "ERROR: can't update $mnt/last -> $log" unless $log eq readlink "$mnt/last"; |
if ( $command =~ $remount_on ) { |
| 77 |
die "RECOVERY updated $mnt/last -> $log\n"; |
my @part = partitions(); |
| 78 |
} else { |
while ( $#before == $#part ) { |
| 79 |
die "$log exists, re-run with --commit or --rollback"; |
warn "re-read partition table\n"; |
| 80 |
|
sleep 1; |
| 81 |
|
@part = partitions(); |
| 82 |
|
} |
| 83 |
|
mount_42 if $part[1]; |
| 84 |
} |
} |
| 85 |
} |
} |
| 86 |
|
|
| 87 |
|
partitions(); |
| 88 |
|
|
| 89 |
|
if ( $init ) { |
| 90 |
|
parted("rm $_") foreach grep { defined $part[$_] } map { $#part - $_ + 1 } ( 1 .. $#part ); |
| 91 |
|
parted("mkpartfs primary ext2 0 42MB"); |
| 92 |
|
parted("mkpart extended 42MB " . $part[0]->[1] . 'MB'); |
| 93 |
|
my $cmd = read_file($0); |
| 94 |
|
write_file( "$mnt/42.pl", $cmd ); |
| 95 |
|
chmod 0755, "$mnt/42.pl"; |
| 96 |
|
exit; |
| 97 |
|
} |
| 98 |
|
|
| 99 |
|
map { mkdir $_ unless -e $_ } map { "$mnt/$_" } ( 'log', 'fs', 'stat' ); |
| 100 |
|
|
| 101 |
|
my $path = shift @ARGV || die "usage: $0 /path/to/file\n"; |
| 102 |
|
|
| 103 |
|
my ($dir,$file) = ($1,$2) if $path =~ m{^(?:(.+)/)?([^/]+)}; |
| 104 |
|
|
| 105 |
my $fs = "$mnt/fs/$dir"; |
my $fs = "$mnt/fs/$dir"; |
| 106 |
mkpath $fs unless -e $fs; |
mkpath $fs unless -e $fs; |
| 107 |
|
|
| 108 |
$fs .= '/' . $file; |
$fs .= '/' . $file; |
|
|
|
| 109 |
die "$fs exists!" if -e $fs; |
die "$fs exists!" if -e $fs; |
| 110 |
|
|
| 111 |
my $cmd = "dd_rescue -l $log -S $opos $path $dev"; |
my @stat = stat($path); |
| 112 |
print "+ $cmd\n"; |
die "can't stat $path: $!" unless @stat; |
| 113 |
system($cmd) == 0 or warn "# exit code: $?"; |
warn "# $path ",$stat[7],$/; |
| 114 |
|
|
| 115 |
|
my $size_mb = int( $stat[7] / 1000 / 1000 ) + 1; # FIXME correctly round to something? |
| 116 |
|
my ( $free_start, undef, $free_size ) = @{$part[0]}; |
| 117 |
|
|
| 118 |
|
my $part_end = $free_start + $size_mb; |
| 119 |
|
|
| 120 |
|
my $last_part = $#part; |
| 121 |
|
|
| 122 |
|
parted("mkpart logical ${free_start}MB ${part_end}MB "); |
| 123 |
|
|
| 124 |
unlink("$mnt/last") && symlink($log,"$mnt/last") || die "can't commit log $log -> $mnt/last"; |
my $part_size = $part[$#part]->[2] || die "can't get size of new partition"; |
| 125 |
|
|
| 126 |
symlink($log,$fs) || die "can't create $fs: $!"; |
die "not enough space on $dev $size_mb > $part_size" if $size_mb > $part_size; |
| 127 |
|
|
| 128 |
print "OK $fs -> $log\n"; |
my $part_nr = $#part; |
| 129 |
|
|
| 130 |
|
write_file( "$mnt/stat/$part_nr", join("\n",@stat) ); |
| 131 |
|
|
| 132 |
|
my $log = "$mnt/log/$part_nr"; |
| 133 |
|
|
| 134 |
|
my $to_dev = $dev . $part_nr; |
| 135 |
|
|
| 136 |
|
symlink( $to_dev ,$fs) || die "can't create $fs: $!"; |
| 137 |
|
|
| 138 |
|
my $cmd = "dd_rescue -w -l $log $path $to_dev"; |
| 139 |
|
print "+ $cmd\n"; |
| 140 |
|
exec $cmd; |
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